Gilberto Gil and Rokia Traoré have been announced as headlining acts for the Womad festival this summer.
The Brazilian singer and former government minister and the Malian star top a bill that also features qawwali singer Asif Ali Khan, rising Zimbabwean band Mokoomba, all-star Colombian group Ondatrópica and the Mercury prize nominated English singer Sam Lee.
Gil was a key figure in Brazil's Tropicália movement in the late 1960s when his protests songs were aimed squarely at the country's military junta. Between 2003 and 2008 he was minister of culture in President Lula's government.
Womad festival director Chris Smith said: "Gilberto Gil's contribution to bringing Brazilian music to an international audience along with his successful political career as minister of culture makes him the perfect artist for our festival. We are honoured to have him perform at Womad in the UK for the first time."
Traoré is one of the most famous singers in Mali and has frequently addressed political and women's rights issues. She will also open the bill at the Glastonbury festival this summer and a new album, Beautiful Africa, will be released on 8 April.
Womad (World of Music, Arts and Dance) was founded in 1980 by Peter Gabriel, among others, with the first festival taking place in Shepton Mallet in Somerset in 1982. In 2007, it moved from its new site in Reading to Charlton Park in Malmesbury, Wiltshire, where it has been staged ever since. Last year's headliners included Robert Plant and Hugh Masekela.
Other acts appearing in July include soul singer Alice Russell, fusion pioneers Osibisa, Romanian brass band Fanfare Ciocărlia, Tuvan singers Huun-Huur-Tu, dubstep producer Mala with his Cuba project, Tuareg outfit Tamikrest and veteran soundsystem DJ David Rodigan,
Womad festivals have also been staged in New Zealand, Abu Dhabi, Spain, the Canary Islands, Sicily and Australia. The WOMADelaide 2013 festival takes place in Adelaide from 8 March, with a lineup that features Jimmy Cliff and Malian stars Salif Keita and Bassekou Kouyate.
• Womad at Charlton Park takes place on 25-28 July. An adult weekend tickets costs £145. The Guardian is the festival's media partner.
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